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main.go
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main.go
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// Copyright 2020 Intel Corporation. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"os"
"os/signal"
"syscall"
"github.com/klauspost/cpuid/v2"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/klog/v2"
)
const (
namespace = "sgx.intel.com"
epc = "epc"
capable = "capable"
)
type patchNodeOp struct {
Value interface{} `json:"value"`
Op string `json:"op"`
Path string `json:"path"`
}
func main() {
var register, affirm, label, daemon bool
flag.BoolVar(®ister, "register", false, "register EPC as extended resource")
flag.BoolVar(&affirm, "affirm", false, "return error if EPC is not available")
flag.BoolVar(&label, "node-label", false, "create node label")
flag.BoolVar(&daemon, "daemon", false, "run as a daemon")
flag.Parse()
klog.Infof("starting sgx_epchook")
// get the EPC size
var epcSize uint64
if cpuid.CPU.SGX.Available {
for _, s := range cpuid.CPU.SGX.EPCSections {
epcSize += s.EPCSize
}
}
klog.Infof("epc capacity: %d bytes", epcSize)
if epcSize == 0 && affirm {
klog.Fatal("SGX EPC is not available")
}
if err := updateNode(epcSize, register, label); err != nil {
klog.Fatal(err.Error())
}
// if the "register" flag is FALSE, we assume that sgx_epchook is used as NFD hook
if !register {
fmt.Printf("%s/%s=%d", namespace, epc, epcSize)
}
if daemon {
klog.Info("waiting for termination signal")
term := make(chan os.Signal, 1)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
<-term
}
}
func updateNode(epcSize uint64, register, label bool) error {
// create patch payload
payload := []patchNodeOp{}
if register {
payload = append(payload, patchNodeOp{
Op: "add",
Path: fmt.Sprintf("/status/capacity/%s~1%s", namespace, epc),
Value: epcSize,
})
}
if label && epcSize > 0 {
payload = append(payload, patchNodeOp{
Op: "add",
Path: fmt.Sprintf("/metadata/labels/%s~1%s", namespace, capable),
Value: "true",
})
}
if len(payload) == 0 {
return nil
}
payloadBytes, err := json.Marshal(payload)
if err != nil {
return err
}
// create the in-cluster config
config, err := rest.InClusterConfig()
if err != nil {
return err
}
// create the clientset
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return err
}
// get the node object
node, err := clientset.CoreV1().Nodes().Get(context.TODO(), os.Getenv("NODE_NAME"), metav1.GetOptions{})
if err != nil {
return err
}
// patch the node
_, err = clientset.CoreV1().Nodes().Patch(context.TODO(), node.Name, types.JSONPatchType, payloadBytes, metav1.PatchOptions{}, "status")
return err
}